Work

Design and fabrication of short-period long period gratings for refractive index sensing

Year: 2025

Type: article

Abstract: Fiber optic sensors offer high sensitivity and remote sensing capabilities. This study explores short-period long period gratings (SP-LPGs), fabricated via femtosecond laser, as compact and highly sensitive alternatives to conventional LPGs for refractive index (RI) sensing. Gratings with different periods were modeled and tested using a microfluidic setup. The shortest period (Λ = 13 μm ) showed high sensitivity and RI resolution (1.1 × 10 −6 RIU), while the longest provided better linearity. An intermediate-period grating (Λ = 14.25 μm ) offered optimal performance, demonstrating that period selection allows for tailoring sensitivity and linearity. These results make SP-LPGs promising for applications in medical diagnostics and environmental monitoring.

Source: Optics Express

DOI: 10.1364/oe.566073

Authors: Riccardo Funari, Rana M. Armaghan Ayaz, Fabrizio Di Pasquale, Claudio J. Oton

Language: English

Topic: Advanced Fiber Optic Sensors

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funders: Dipartimenti di Eccellenza, European Commission, Ministero dell'Università e della Ricerca

Awards: G6411646436, G7477258482